700x^5=129x^4+489x^3+709x^2+598x+584
    10/(x-1)-(1001*x-1001)/(90*x)+2.1=0
    arcsin0.731858=x
    3a^(2)+14a－12＝0
    (25(x^2)/9)+6x-7=0
    arcsin0.737576=x
    arcsinx=0.737576
    tanX = 1
    tanX = (1/2.2)
    x=(1.0×14.3×900×0.062×925)/360
    tanX = 2.2
    x=1-√(1-2*0.06 )
    x=(656.4×10^6)/(1.0×14.3×900×925^2 )
    r=(1-r)^5
    r=(1-r)^4
    r=(1-r)^3
    x^3-7x-6
    x^4-7x-6=0
    -10x＋60x-8000＝750
    X^2-3x-4=0

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